Do not underestimate SRD:) After all, just when I thought everything was peachy he was able to give me a heart attack by giving the codes to Angus's datacore to Nick:)I keep coming back to, why does his changing from death to life need to change his relationship with the Arch? It did not when he died, and it did not when he was resurrected to defend it against Foul.
He may yet come up with some very plausible explanation for a fact that, say, TC gradually lost wild magic, because by becoming part of the Arch it somehow "thinned", or I don't know... That would be an interesting situation, we would certainly get our old, grumpy, desperate TC back, questing to get back his wild magic...